Since 1948, the USSR had dominated the World Chess Championships - evidence, Moscow claimed, of the superiority of the Soviet system. But then came Bobby Fischer. A dysfunctional genius, Fischer was uniquely equipped to take on the Soviets. His every waking hour was devoted to the game and he had steamrollered all opposition to reach the championship. When he became increasingly volatile, Henry Kissinger telephoned Fischer and urged him on to fight for his country. Against him was Boris Spassky: complex, sensitive, the most un-Soviet of champions. As the authors reveal, when Spassky began to lose, the KGB decided to help him to fight back